On 9 Jun 2005 at 14:03, Toby Erkson wrote:
> I disagree: Preignition is when the fuel mixture starts burning before
> it should, either by something else hot w/in the combustion chamber or
> by compression, whereas detonation is the explosive burning of the fuel
> mixture instead of the normal (slower) burning of the fuel.
It doesn't sound to me like we disagree on anything. Preignition is just a
generic term that applies to any combustion that occurs before the spark for
any reason.
Regardless of the cause, early ignition generally results in a explosive,
rather than controlled, burn, which can be damaging to an engine.
Someone else mentioned ping. That's the 4th term that can mean the same thing
as knock, detonation, the compression-caused form of preignition.
--
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Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
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